(a) Draw the circuit diagram for studying the characteristics of an n-p-n transistor in common emitter configuration.

(b) With the help of its input and output characteristics, how would you find the input resistance and the current gain from these characteristics?

 

 
 
 
 
 

Answers (1)
S safeer

(a)

Ib = Base current

VBC = Base emitter voltage

IC = collector current

VCE = collector emiiter voltage

IE = Emitter current

(b)  Input characteristics are the relation between the base current and base-emitter voltage with a constant collector-emitter voltage

Output characteristics are the relation between collector current and collector-emitter voltage with base current as constant.

Input resistance.

r_{i}= \left (\frac{\Delta V_{BE}}{\Delta I_{B}} \right )_{V_{CE}}

Current gain is the ratio of change in collector current to the change in the base current at a constant collector-emitter voltage \left ({V_{CE}} \right )

Thus,

\beta = \left ( \frac{\Delta I_{C}}{\Delta I_{B}} \right )_{V_{CE}}

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